It also has a lot to do with the intensity in terms of eating.
LISS- do this fasted as it is easy cardio
HIIT- 2 hours prior, mix all 3 macros together. Sustained release,more performance and therefore more calories burnt and therefore greater fat loss.
Don't worry touch about HSL and cAMP to much, eat right, sleep to manage cortisol and train hard.
With this being said, we must forget about this fat burning zone business.
Sugars burn first therefore a glycolytic workout such as HIIT needs to be with food but to reap full benefits, the consumption of more healthy fats instead of complex carbs the better.
Eat more fats to burn fat...this is better for endurance and will in turn help HIIT workouts.
LISS is predominantly a slow burn and needs to be done fasted to reap benefits.
Fat Loss will be most fueled through adequate/proper mix Of nutrition and whatever cardio chosen should be in reflected to regime and food intake
Sorry to hijack this thread. Needed my .02 cents in